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Don't copy the key in do_move

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It will be overwritten anyway.

Also other little small touches that seem to increase
speed more then the whole enum Score patch series :-(

Optimization is really a black art.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-11-08 17:56:41 +01:00
parent ef6fca98a0
commit f35ddb04af
2 changed files with 10 additions and 7 deletions
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14
src/position.cpp
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@@ -718,7 +718,7 @@ void Position::do_move(Move m, StateInfo& newSt, Bitboard dcCandidates) {
// ones which are recalculated from scratch anyway, then switch our state
// pointer to point to the new, ready to be updated, state.
struct ReducedStateInfo {
Key key, pawnKey, materialKey;
Key pawnKey, materialKey;
int castleRights, rule50, pliesFromNull;
Square epSquare;
Value value;
@@ -758,16 +758,15 @@ void Position::do_move(Move m, StateInfo& newSt, Bitboard dcCandidates) {
Piece piece = piece_on(from);
PieceType pt = type_of_piece(piece);
PieceType capture = ep ? PAWN : type_of_piece_on(to);
assert(color_of_piece_on(from) == us);
assert(color_of_piece_on(to) == them || square_is_empty(to));
assert(!(ep || pm) || piece == piece_of_color_and_type(us, PAWN));
assert(!pm || relative_rank(us, to) == RANK_8);
st->capture = ep ? PAWN : type_of_piece_on(to);
if (st->capture)
do_capture_move(key, st->capture, them, to, ep);
if (capture)
do_capture_move(key, capture, them, to, ep);
// Update hash key
key ^= zobrist[us][pt][from] ^ zobrist[us][pt][to];
@@ -817,7 +816,7 @@ void Position::do_move(Move m, StateInfo& newSt, Bitboard dcCandidates) {
st->pawnKey ^= zobrist[us][PAWN][from] ^ zobrist[us][PAWN][to];
// Set en passant square, only if moved pawn can be captured
if (abs(int(to) - int(from)) == 16)
if ((to ^ from) == 16)
{
if (attacks_from<PAWN>(from + (us == WHITE ? DELTA_N : DELTA_S), us) & pieces(PAWN, them))
{
@@ -830,6 +829,9 @@ void Position::do_move(Move m, StateInfo& newSt, Bitboard dcCandidates) {
// Update incremental scores
st->value += pst_delta(piece, from, to);
// Set capture piece
st->capture = capture;
if (pm) // promotion ?
{
PieceType promotion = move_promotion_piece(m);